新式模型技术或将淘汰工程样品模式
文章来源:未知 文章作者:enread 发布时间:2013-11-20 07:13 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
A new modelling technique has been developed that could eliminate the need to build costly1 prototypes(原型), which are used to test engineering structures such as aeroplanes. The study, by Dr Róbert Szalai at the University of Bristol, is published in the latest issue of the Proceedings2 of the Royal Society A.
 
Most engineering structures, for example airplane landing gear, jet engines and gearboxes(变速箱), involve friction3(摩擦力) and impact among their components4. Traditionally these harsh phenomena5 are difficult to design for and introduce a great deal of uncertainty6 in the final product.
 
The new research offers an alternative view on this problem by providing a modelling technique that allows for more accurate predictions than methods currently available. The proposed method also offers a better understanding of contact mechanics, which might be used to achieve a better design.
 
Dr Róbert Szalai, Lecturer in the Department of Engineering Mathematics, said: "One of the greatest concerns of engineers is modelling friction and impact.
 
"Building prototypes to test engineering structures can be extremely expensive and this new modelling technique could mean a prototype does not need to be built."
 
Alan Champneys, Professor of Applied7 Non-linear Mathematics in the Department of Engineering Mathematics, added: "Strongly nonlinear behaviour, such as stick-slip motion and impact, are a huge cause of uncertainty in engineering systems.
 
"The findings from this paper provide a key breakthrough in research that is being pursued by a consortium of major universities and industrialists8 to address these problems as part of an EPSRC programme grant."
 
In the paper, the researcher has presented a general mechanical model and described a model reduction technique. The new model includes a memory term to account for effects that traditional models ignore. The study has also discussed the convergence(收敛,集合) of the method and its implications to non-smooth systems.
 
The derivation of the memory term is illustrated9 through the examples of a pre-tensed string and a cantilever10 beam. The paper has used the example of a bowed string and has demonstrated the properties of the transformed equation of motion, in particular its convergence as the number of vibration11 modes goes to infinity12.


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1 costly 7zXxh     
adj.昂贵的,价值高的,豪华的
参考例句:
  • It must be very costly to keep up a house like this.维修这么一幢房子一定很昂贵。
  • This dictionary is very useful,only it is a bit costly.这本词典很有用,左不过贵了些。
2 proceedings Wk2zvX     
n.进程,过程,议程;诉讼(程序);公报
参考例句:
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
3 friction JQMzr     
n.摩擦,摩擦力
参考例句:
  • When Joan returned to work,the friction between them increased.琼回来工作后,他们之间的摩擦加剧了。
  • Friction acts on moving bodies and brings them to a stop.摩擦力作用于运动着的物体,并使其停止。
4 components 4725dcf446a342f1473a8228e42dfa48     
(机器、设备等的)构成要素,零件,成分; 成分( component的名词复数 ); [物理化学]组分; [数学]分量; (混合物的)组成部分
参考例句:
  • the components of a machine 机器部件
  • Our chemistry teacher often reduces a compound to its components in lab. 在实验室中化学老师常把化合物分解为各种成分。
5 phenomena 8N9xp     
n.现象
参考例句:
  • Ade couldn't relate the phenomena with any theory he knew.艾德无法用他所知道的任何理论来解释这种现象。
  • The object of these experiments was to find the connection,if any,between the two phenomena.这些实验的目的就是探索这两种现象之间的联系,如果存在着任何联系的话。
6 uncertainty NlFwK     
n.易变,靠不住,不确知,不确定的事物
参考例句:
  • Her comments will add to the uncertainty of the situation.她的批评将会使局势更加不稳定。
  • After six weeks of uncertainty,the strain was beginning to take its toll.6个星期的忐忑不安后,压力开始产生影响了。
7 applied Tz2zXA     
adj.应用的;v.应用,适用
参考例句:
  • She plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
8 industrialists 0dad60c7e857d7574674d1c3c3f6ad96     
n.工业家,实业家( industrialist的名词复数 )
参考例句:
  • This deal will offer major benefits to industrialists and investors. 这笔交易将会让实业家和投资者受益匪浅。 来自《简明英汉词典》
  • The government has set up a committee of industrialists and academics to advise it. 政府已成立了一个实业家和学者的委员会来为其提供建议。 来自《简明英汉词典》
9 illustrated 2a891807ad5907f0499171bb879a36aa     
adj. 有插图的,列举的 动词illustrate的过去式和过去分词
参考例句:
  • His lecture was illustrated with slides taken during the expedition. 他在讲演中使用了探险时拍摄到的幻灯片。
  • The manufacturing Methods: Will be illustrated in the next chapter. 制作方法将在下一章说明。
10 cantilever IWizY     
n.悬梁臂;adj.采用伸臂建成的
参考例句:
  • The idea of cantilever construction is ancient in the Orient.在古代东方就已实行过悬臂施工。
  • The structure consists basically of two cantilever beams.这种结构基本上由两根悬臂梁组成。
11 vibration nLDza     
n.颤动,振动;摆动
参考例句:
  • There is so much vibration on a ship that one cannot write.船上的震动大得使人无法书写。
  • The vibration of the window woke me up.窗子的震动把我惊醒了。
12 infinity o7QxG     
n.无限,无穷,大量
参考例句:
  • It is impossible to count up to infinity.不可能数到无穷大。
  • Theoretically,a line can extend into infinity.从理论上来说直线可以无限地延伸。
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